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    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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  <body>
    <script>
      // sort 排序

      var arr = [4, 3, 2]
      /*
      交换两个位置
      var temp = arr[0]
      arr[0] = arr[1]
      arr[1] = temp
      console.log(arr)*/
      for (var m = 0; m < arr.length - 1; m++) {
        for (var i = 0; i < arr.length - 1; i++) {
          if (arr[i] > arr[i + 1]) {
            var temp = arr[i]
            arr[i] = arr[i + 1]
            arr[i + 1] = temp
            console.log(arr) // [2,3,4]
          }
        }
      }
    </script>
  </body>
</html>
